No. 103: Halliburton
Previous Rank: 106
Headquarters: Houston, Texas
[Photo: Bexar County Judge Nelson Wolff, in straw hat, and Texas State Senator Carlos Uresti, in dark suit, arrive at Halliburton's San Antonio Operations Center on Loop 1604 just west of I-37 on the south side, for their grand opening.] less

No. 202: Anadarko Petroleum
Previous Rank: 207
Headquarters: The Woodlands, Texas
[Photo: Don Vardeman, vice president of worldwide projects management at Anadarko Petroleum Corporation, talks at Kiewit Offshore Services in front of the topside production module that will be attached to the Lucius truss spar.] less

No. 203: EOG Resources
Previous Rank: 233
Headquarters: Houston
[Photo: EOGs ongoing improvements in drilling and completion techniques transformed the Bakken from a steady development program into a high rate-of-return growth play.] less

No. 203: EOG Resources
Previous Rank: 233
Headquarters: Houston
[Photo: EOGs ongoing improvements in drilling and completion techniques transformed the Bakken from a steady development program into a high ... more

No. 661: NuStar Energy
Previous Rank: 389
Headquarters: San Antonio, Texas
[Photo: Steven Schmidt, right, Terminal Manager of NuStar in Port Corpus Christi, talks with Greg Matula, also of NuStar, at the contraction site of the new pier for oil tankers.] less